FIELD: chemistry.
SUBSTANCE: method for preparing a pro-catalyst composition for the polymerization of olefins involves pre pro-catalyst precursor halogenation with a halogenating agent before or after adding the Benzoate-containing composition and amido-etherical donor to the halogenated pro-catalyst precursor to the reaction mixture. Production of pro catalyst composition comprising a magnesium component, a titanium component and an internal electron donor comprising esteramide. Esteramide structure is 
(I). Procatalyst composition, catalyst composition, the process of preparing the polymer are also described .
EFFECT: improving the catalytic activity or selectivity of the catalyst and obtaining the propylene-based olefin having a broad molecular weight distribution.
13 cl, 6 tbl, 13 ex
